I had somethin' like that a few months ago. I tried adaware, hijackthis, etc. searched thread after thread trying to find a way to get rid of the shit....nothing worked. Eventually I backed up the important info and formatted the drive. Like you, I was running 98SE on that machine and I switched it over to XP Pro with service pack 2. XP sucks at first, but trust me it is sooo much better. Have fun rebooting.
